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G500s: Screen brightness is not adjustable in Windows 7

Question

I had lenovo G500s recently with Windows 8 with 64bit preloaded.I got bored with Windows 8 hence downgraded to Windows 7 Home Premium 64bit.

 

Windows 7 worked very fine after installing the device drivers except for the LCD brightness that doesn't respond to any fine adjustments.

 

In the main page of Windows Power Managemet  as well as the keyboard hotkeys, the slider either goes to the maximum or minimum brightness (no stages in between though in Windows 8 there were more than 6 stages)

 

In the advanced settings screen, as far as I adjust brightness (for example to 50% on battery, 70% plugged in) this doesn't lead to any change in the brightness practically.

 

How to solve this?

Answer

A BIOS update is needed to fix this issue.

 

It seems that this issue may occur in some systems with below spec:

Lenovo G400s\G500s shipped with panel SEC LTN156AT30-L01 (18200896) with BIOS versions less than V1.11.

 

For G400s\G500s, update BIOS to 1.11 version or above version.

For G400\G500, update BIOS to 1.07 version or above version.

 

You can refer to this tip for more information: http://support.lenovo.com/en_US/detail.page?DocID=HT078787

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Comments

asy On 2014-06-21, 15:07 PM

i have the problem while installing BIOS flas for windows 7 it gives the error as " the version of ROM file is not newer than that of BIOS"..

how to slove the problem..?

 

dragnoak On 2015-02-15, 19:20 PM
ltmerritt73 On 2015-03-18, 17:17 PM

i keep trying to post a link to the updated BIOS, but it will not post. The updated "cured" my g500s' aiments this morning.

Hoov On 2015-03-18, 17:13 PM
Hoov On 2015-03-18, 17:05 PM
prince-rachit On 2015-03-22, 3:58 AM

Install Intel graphics driver HD. Go to it's site>Download installer>It will auto select the required version>Install>Restart>Working.


I faced this issue for 4 hours until I realized that something was missing. Further the ROM update won't work. It is not installing.

If it works say thanks.

sysphous On 2015-04-09, 19:06 PM

Updating bios and intel graphics driver didn't solve the problem. It's still not adjustable. It has only two adjustments: minimum brightness or maximum brightness. I tried both 32 and 64 bit windows 7, it's not working.

ls88 On 2015-04-16, 0:26 AM

May I ask where you get Windows 7 Home Premium software? Because I need to reinstall Windows 7 Home Premium on my lenovo laptop. Thanks!

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